woodie582

Hi all,

I have a mild built 350 that was not running vac advance. I swapped out the original distributor with a pertronix billet intending to run manifold advance. This is where it’s at: initial is 12
32 with can hooked up
50 all in around 3200rpm.
4 speed, 3.23 gears. Starts quick when hot. Pertronix told me the can would add 14, wrong. My concern is the 32; haven’t driven it yet.

Fun71

What does "32 with can hooked up" and "50 all in around 3200rpm" mean? Do you have the vacuum advance connected for those numbers? If so, disconnect it and set the total to 34-36. Then connect the vacuum advance can.

woodie582

32 at idle with advance hooked up
50 @ 3200 rpm total with advance hooked up.
If I go for 34-36 I end up with 64-66 total @ 3200 rpm
The advance unit is putting in 20 degrees.

oldcutlass

You need to limit your vacuum advance with something like this if you want to go to 34/36. They are available through, Summit, Jeggs, Amazon, ebay, etc...

woodie582

Thanks Eric thats what I was looking at. I also have a dyno set up in January so I may just let them do the final set-up.

Fun71

Set your total (initial + mechanical) to 34-36 with the vacuum disconnected.

From there you have several options:
- Run it with the vacuum advance disconnected
- Connect vacuum advance to a ported source so it doesn't add to the idle timing
- Get a different vacuum can with less advance
- Buy and install the limiter posted above
- Make your own limiter as shown below

https://classicoldsmobile.com/forums...ck-timing.html